CN102299341A - Tinsel battery plate with surface accidented treatment for lithium ion battery and manufacture method thereof - Google Patents
Tinsel battery plate with surface accidented treatment for lithium ion battery and manufacture method thereof Download PDFInfo
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- CN102299341A CN102299341A CN201110130138XA CN201110130138A CN102299341A CN 102299341 A CN102299341 A CN 102299341A CN 201110130138X A CN201110130138X A CN 201110130138XA CN 201110130138 A CN201110130138 A CN 201110130138A CN 102299341 A CN102299341 A CN 102299341A
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- metal forming
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- pole plate
- ion battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a tinsel battery plate with a surface accidented treatment for a lithium ion battery and a manufacture method thereof. The battery plate including an anode plate or a cathode plate consists of tinsel and coating material layers coated on an upper layer and a lower layer of the tinsel. The tinsel comprises flattening and smooth zones A and A' on two sides and a central irregular accidented treatment zone B. The accidented treatment zone B is centered around a center line H on the upper surface and the lower surface of the tinsel. The battery plate of the invention has a simple and reasonable structure and a long usage life, and is able to increase a contact area between the tinsel and the coating material. The coating with strong adhesion is not easily fallen off and capable of reducing energy density decrease caused by a large adhesive content in an active substance.
Description
Technical field
The present invention relates to lithium rechargeable battery and make the field, a kind of specifically concave-convex surface is handled metal forming lithium ion battery pole plate and manufacture method thereof.
Background technology
Along with the progress of science and technology and the development of society, 21 century has entered the electronic information epoch, and the electronic information epoch have higher requirement for power supply, and the demand of portable power source increases fast.Lithium ion battery is as the present ideal in the world and the highest chargeable chemical cell of technology content, because the advantage that lithium ion battery has high voltage, high power capacity, has extended cycle life, security performance is good, it is had broad application prospects in many-sides such as portable electric appts, electric automobile, space technology, national defense industry, be widely used in mobile phone, laptop computer, video camera, electric bicycle, space flight and aviation, military mobile communication facility and fields such as equipment and electric automobile, its demand is with increasing.
So-called lithium ion battery is meant respectively with two and can reversibly embeds and the compound of the removal lithium embedded ion secondary cell as the both positive and negative polarity formation.When battery charge, lithium ion takes off embedding from positive pole, in negative pole, embed, otherwise during discharge.
Secondary cell (Secondary Battery) refers to the battery that can charge and discharge with the primary cell difference that can not charge, uses extensively in high-new e-machine fields such as mobile phone, notebook computer, video cameras.Particularly the operating voltage of lithium rechargeable battery is 3.6V, so the nickel-cadmium cell or the Ni-MH battery that are used on the electronics power supply compared with majority are high 3 times, on the high side of per unit weight energy density, be the trend of extending rapidly, particularly as the energy source of future generation in soaring oil prices epoch, install and use on the electronics motor vehicle, lithium rechargeable battery has multiple shape, represents shape that cylindrical shape, rectangle and aluminium bag shape are arranged.
No matter be which kind of shape, secondary cell all is to be assembly with the pole plate assembly that can generate electricity in the above-mentioned shape, and its pole plate assembly is to form with the barrier film of getting involved between different mutually pole plates and the two kinds of pole plates.
Battery pole plates is the important component part that constitutes lithium ion battery, it comprises positive plate and minus plate, its structure is by coated on both sides (Coating) active material in metal forming, and then through cutting and operation such as calendering constitutes, the metal forming that positive plate and minus plate are commonly used is aluminium foil and Copper Foil in the market, because very smooth smooth of the surface of metal forming, so coated (Coating) active material adhesive force on aluminium foil or Copper Foil is little, be easy to come off, thereby the pole plate that applies (Coating) calendering when causing discharging and recharging drops from paper tinsel, increases contact resistance and causes the reduction in cycle characteristics and useful life.
For fear of the common way of coming off of coating material is the amount that increases adhesive in coating material, will play energy density like this and can reduce, and influences the performance of lithium rechargeable battery.
Also occurred the concavo-convex metal forming of having handled of surperficial process in the market, the whole concavo-convex processing after-drawing intensity of metal forming can weaken; When on metal forming, applying active material, unreel the metal forming that unreels on the device and can be subjected to the effect that coating equipment (Coater) is gone up certain tension force, from the position, both sides of metal forming toward tension force vertical direction can ftracture (Crack).Particularly when making aluminium bag shape battery (Aluminum Pouch Type), a lot of pole plates of opening are used lug welding (Tab Welding) and are handled, but because the paper tinsel face is concavo-convex, have the shortcoming that welding (Welding) face drops.
In addition, the metal forming that concavo-convex processing region and not concavo-convex processing region are obviously distinguished is carried out the pole plate that active material applies (Coating), in calender line, when roll simultaneously at coating (Coating) position and uncoated (Coating) position, can be because apply the thickness deviation at (Coating) position and uncoated (Coating) position, cause pole plate to produce fold, thereby pole plate can ftracture (Crack).
Summary of the invention
The objective of the invention is to provide a kind of simple and reasonable, can increase the contact area of metal forming and coating (Coating) material, apply strong adhesion, the difficult drop-off of (Coating) material, can reduce the minimizing of the energy density that binder content causes greatly in the active material, the concave-convex surface of lithium ion battery long service life is handled metal forming lithium ion battery pole plate and manufacture method thereof.
The object of the present invention is achieved like this, this battery pole plates comprises plate or cathode plate, it is to be made of metal forming and the coating material layer that is coated in the metal forming upper and lower surface, and described metal forming comprises smooth smooth areas A in both sides and A ', middle irregular concavo-convex processed district B.
Described concavo-convex processed district B is arranged on the zone line of metal forming upper and lower surface along center line H both sides.
The groove on the described concavo-convex processed district B and the density distribution of raised points are to be arranged to thin gradual change by close to smooth smooth areas A in both sides and A ' along metal forming center line H, the regional groove that distance center line H is near and the density of raised points are big, and is little apart from the density of the smooth smooth areas A in both sides and regional groove of A ' and raised points.
The groove on the described concavo-convex processed district B and the density distribution of raised points are to be arranged to thin segmentation gradual change by close to smooth smooth areas A in both sides and A ' along metal forming center line H, the groove of distance center line H near field section and the density of raised points are big, and is little apart from the density of the smooth smooth areas A in both sides and A ' near field section groove and raised points.
The present invention has the following advantages and good effect:
1, the present invention is because the zone that has irregular groove and raised points is processed in coating (Coating) zone of the metal forming (aluminium foil and Copper Foil) that lithium rechargeable battery positive plate and minus plate is commonly used, enlarged the contact area of metal forming and coating (Coating) material, increased coating (Coating) material strong adhesion, avoided the obscission in the course of processing to take place.
2, the present invention is owing to adopt said structure, increase the contact area that applies (Coating) material, increased the adhesive force of coating material, so can reduce the content of adhesive in the active material, cause the increase of energy density by it, because of using this pole plate, improved the useful life of lithium ion battery.
3, the present invention is owing to the zone with the concavo-convex processing of metal foil surface process is arranged on the middle part, avoided the generation of the phenomenon that the whole concavo-convex processing after-drawing intensity of metal forming can weaken, simultaneously unreel the metal forming that unreels on the device man-hour and be subjected to applying under the effect of the certain tension force of (Coating) equipment (Coater) adding, also can not ftracture (Crack) at the position, both sides of metal forming.
4, the present invention is owing to adopt the density distribution of metal foil surface through groove on the zone of concavo-convex processing and raised points from inside to outside by close mode of arranging to thin gradual change, so avoided concavo-convex processing region and without concavo-convex processing region in calender line, apply (Coating) position and uncoated (Coating) position when rolling simultaneously produce the fold and pole plate cracking (Crack) imagination owing to apply the pole plate that the thickness deviation at (Coating) position and uncoated (Coating) position causes.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
Fig. 2 is an A-A profile among Fig. 1 of the present invention.
Fig. 3 is the local structure for amplifying schematic diagram in C place among Fig. 2 of the present invention.
Fig. 4 is that the density continuous gradation of the groove in the concavo-convex processed district and raised points on the metal forming of the present invention distributes structural representation is set.
Fig. 5 is that the density segmentation graded profile of the groove in the concavo-convex processed district and raised points is provided with structural representation on the metal forming of the present invention.
Fig. 6 is that the present invention is compared with the prior art power of battery characteristic optimizing curve chart.
Fig. 7 is that the present invention is compared with the prior art battery charging and discharging cycle volume change rate schematic diagram.
Fig. 8 is the cycle rate of change intention that the present invention is compared with the prior art cell resistance.
Embodiment
Shown in accompanying drawing 1,2,3: this battery pole plates comprises metal forming 1, applies (Coating) at the coating material layer 2(of metal forming 1 upper and lower surface active material slurry layer), described metal forming 1 comprises smooth smooth areas A in both sides and A ', middle irregular concavo-convex processed district B.
Described concavo-convex processed district B is arranged on the zone line of metal forming 1 upper and lower surface along the center line H both sides among Fig. 1.
Shown in accompanying drawing 4: the groove on the described concavo-convex processed district B and the density distribution of raised points are to be arranged to thin continuous gradation by close to smooth smooth areas A in both sides and A ' along metal forming 1 center line H, the regional groove that distance center line H is near and the density of raised points are big, and is little apart from the density of the smooth smooth areas A in both sides and regional groove of A ' and raised points.
Shown in accompanying drawing 5: the groove on the described concavo-convex processed district B and the density distribution of raised points are to be arranged to thin segmentation gradual change by close to smooth smooth areas A in both sides and A ' along metal forming 1 center line H, the groove of distance center line H near field section and the density of raised points are big, and is little apart from the density of the smooth smooth areas A in both sides and A ' near field section groove and raised points.
Described metal forming 1 is meant aluminium foil and Copper Foil, and anode can use the purity of aluminium at the aluminium foil more than 99%, and negative electrode can use Copper Foil.
The width of described smooth smooth areas A and A ' is at least more than the 20mm, and its width is to consider the width of bulk metal paper tinsel and the tension force on thickness and the effect metal forming and determine.
Concave-convex surface processing metal forming lithium ion battery of the present invention may further comprise the steps with the manufacture method of pole plate:
1., slurry (active material) preparation
The coating of a, positive plate (Coating) slurry feedstock is as follows.Anode binder PVDF is disperseed and be dissolved among the solvent NMP, thereby make wet glue (Binder Solution).Then active material cobalt acid lithium (Lithium cobalt oxide), LiMn2O4 (Lithium Manganese Oxide), nickel cobalt lithium manganese (Lithium nickel Manganese cobalt oxide), lithium ion oxide such as LiFePO4 (Lithium iron phosphate) oxide and anode conducting (Conductive Powder) carbon (Carbonblack) or carbon nano-tube (Carbon Nanotubes) are mixed in the wet glue (Binder Solution), thereby make slurry.
The coating of b, minus plate (Coating) slurry feedstock is as follows.Cathode adhesive PVDF is disperseed and be dissolved among the solvent NMP, thereby make wet glue (Binder Solution).Then cathode active material carbon (Carbon) or graphite (Graphite) are mixed in the wet glue (Binder Solution), thereby make slurry.Can add negative electrode conduction son (Conductive Powder) carbon (Carbonblack) or carbon nano-tube (Carbon Nanotubes) here.Can replace solvent NMP to use distilled water (Distilled water) then.
2., the coating (Coating) of slurry (Slurry)
The metal forming of rolling unreeled with identical tension force be fed on coating (Coating) equipment, 1. middle coating (Coating) active material slurry for preparing of step is applied (Coating) on metal forming by application head (Coating Head), for solvent and the moisture of removing on the slurry carries out dried, the thickness of test slurry and density, rolling then; The coating of the another side of metal forming (Coating) process is identical with above-mentioned steps.
3., the pole plate that has applied active material layer is cut (Slitting)
Cutting process is with the cutting of the pole plate after applying, guaranteeing the width of calendering rolling, by the process with the cutter rolling of same widths.When making cylindrical battery, also can finish behind the calender line and cut (Slitting).
4., pole plate calendering (Pressing)
For active material capacity density on the pole plate that improves coating (Coating) end, improve the effect of the adhesivity between metal forming and the active material, pole plate is by between two wheels (Roll) that approximately are heated to 120 ℃ of temperature, pole plate is rolled (Pressing) to desirable thickness, utilize non-weaving cloth that foreign substances is removed, pole plate rolling then in the surface of calendering pole plate.
In rolling (Pressing) journey, apply the words that (Pressing) rolled in (Coating) zone and uncoated (Coating) zone simultaneously, applying (Coating) position and uncoated (Coating) position can be because of thickness deviation, fold can take place in pole plate, as Fig. 4, shown in 5, begin to improve the density of concavo-convex processing toward the central area at not concavo-convex processing region, thereby reduce the pressure that pole plate is subjected to, can prevent the cracking and the fold of pole plate.
5., pole plate punching press (Punching)
The pole plate that has rolled is carried out punching press (Punching), this process can form when making aluminium bag shape (Aluminum Pouch Type) pole plate, this process is meant the pole plate of calendering is conformed to battery size (Size) by it, carries out many with punching press cutter (Knife) or mould and get sheet.
6., pole plate carries out drying (Vacuum Dry)
Every the pole plate intact to punching press carries out drying (Vacuum Dry), and this process is meant in vacuum drying chamber, dry certain hour, and dewatered process, thus the pole plate manufacturing engineering leaves it at that.
Adopt the pole plate battery of making and the pole plate battery that uses metal forming not handle through convex-concave of structure of the present invention, discharge power can be optimized (as shown in Figure 6) more than 50%.
In addition, on the Cycle characteristic, every Cycle capacity (Capacity) rate of change (as shown in Figure 7) does not have the battery of the common metal paper tinsel of concavo-convex processing compared with use, can see superior a lot.
Also have, every Cycle contact resistance (Resistance) rate of change (as shown in Figure 8) does not have to apply on the common metal paper tinsel of concavo-convex processing the battery of the active material pole plate of (Coating) compared with use, can see and use the battery that has concavo-convex metal forming to apply the active material pole plate of (Coating) that more improvement is arranged.
Particularly, as the situation of plate, the oxide-film on surface is contained in the purity of aluminium electrification, extensive use of chemical fedtilizers and other farm chemical on the paper tinsel more than 99%, thereby reduces contact resistance.
Claims (8)
1. a concave-convex surface is handled metal forming lithium ion battery pole plate, this battery pole plates comprises plate or cathode plate, it is to be made of metal forming (1) and the coating material layer (2) that is coated in metal forming (1) upper and lower surface, it is characterized in that: described metal forming 1 comprises smooth smooth areas A in both sides and A ', middle irregular concavo-convex processed district B.
2. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, and it is characterized in that: described concavo-convex processed district B is arranged on the zone line of metal forming (1) upper and lower surface along center line H both sides.
3. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, it is characterized in that: the groove on the described concavo-convex processed district B and the density distribution of raised points are to be arranged to thin continuous gradation by close to smooth smooth areas A in both sides and A ' along metal forming (1) center line H, the regional groove that distance center line H is near and the density of raised points are big, and is little apart from the density of the smooth smooth areas A in both sides and regional groove of A ' and raised points.
4. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, it is characterized in that: the groove on the described concavo-convex processed district B and the density distribution of raised points are to be arranged to thin segmentation gradual change by close to smooth smooth areas A in both sides and A ' along metal forming (1) center line H, the groove of distance center line H near field section and the density of raised points are big, and is little apart from the density of the smooth smooth areas A in both sides and A ' near field section groove and raised points.
5. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, it is characterized in that: described irregular concavo-convex processed district B realizes by punching press processing or corrosion treatment.
6. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, and it is characterized in that: described metal forming (1) is meant aluminium foil and Copper Foil.
7. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, it is characterized in that: to be employing purity carry out concavo-convex processing as metal forming and by electrochemical mode to the irregular concavo-convex processed district B of centre at the aluminium foil more than 99% to described plate.
8. a kind of concave-convex surface according to claim 1 is handled metal forming lithium ion battery pole plate, it is characterized in that: described coating material floor (2) is meant the coat that forms on the irregular concavo-convex processed district B in the middle of the metal forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110130138XA CN102299341A (en) | 2011-05-19 | 2011-05-19 | Tinsel battery plate with surface accidented treatment for lithium ion battery and manufacture method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110130138XA CN102299341A (en) | 2011-05-19 | 2011-05-19 | Tinsel battery plate with surface accidented treatment for lithium ion battery and manufacture method thereof |
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| CN102299341A true CN102299341A (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110130138XA Pending CN102299341A (en) | 2011-05-19 | 2011-05-19 | Tinsel battery plate with surface accidented treatment for lithium ion battery and manufacture method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229529A (en) * | 2016-07-31 | 2016-12-14 | 长沙科创投资管理有限公司 | A kind of bipolar plates for adding water battery |
| CN108336296A (en) * | 2017-12-28 | 2018-07-27 | 广州倬粤动力新能源有限公司 | Pole plate anticreep herbal paste method |
| CN114614023A (en) * | 2020-12-09 | 2022-06-10 | 比亚迪股份有限公司 | Lithium battery negative electrode current collector and manufacturing method thereof, lithium battery negative electrode and lithium battery |
| WO2024020835A1 (en) * | 2022-07-27 | 2024-02-01 | 宁德时代新能源科技股份有限公司 | Current collector, electrode sheet, battery, electric device and manufacturing method for electrode sheet |
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| CN1534813A (en) * | 2003-03-28 | 2004-10-06 | 三洋电机株式会社 | Negative electrode for lithium secondary cell |
| US20100129718A1 (en) * | 2008-02-14 | 2010-05-27 | Hiroshi Higuchi | Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method for producing negative electrode for lithium secondary battery |
| CN202067861U (en) * | 2011-05-19 | 2011-12-07 | 长春派司毗电子有限公司 | Pole plate for realizing convex-concave surface treatment of metal foil lithium ion batteries |
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2011
- 2011-05-19 CN CN201110130138XA patent/CN102299341A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534813A (en) * | 2003-03-28 | 2004-10-06 | 三洋电机株式会社 | Negative electrode for lithium secondary cell |
| US20100129718A1 (en) * | 2008-02-14 | 2010-05-27 | Hiroshi Higuchi | Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method for producing negative electrode for lithium secondary battery |
| CN202067861U (en) * | 2011-05-19 | 2011-12-07 | 长春派司毗电子有限公司 | Pole plate for realizing convex-concave surface treatment of metal foil lithium ion batteries |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229529A (en) * | 2016-07-31 | 2016-12-14 | 长沙科创投资管理有限公司 | A kind of bipolar plates for adding water battery |
| CN108336296A (en) * | 2017-12-28 | 2018-07-27 | 广州倬粤动力新能源有限公司 | Pole plate anticreep herbal paste method |
| CN108336296B (en) * | 2017-12-28 | 2021-03-19 | 广州倬粤动力新能源有限公司 | Paste-dropping-preventing method for polar plate |
| CN114614023A (en) * | 2020-12-09 | 2022-06-10 | 比亚迪股份有限公司 | Lithium battery negative electrode current collector and manufacturing method thereof, lithium battery negative electrode and lithium battery |
| WO2024020835A1 (en) * | 2022-07-27 | 2024-02-01 | 宁德时代新能源科技股份有限公司 | Current collector, electrode sheet, battery, electric device and manufacturing method for electrode sheet |
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Application publication date: 20111228 |